Q: A linear regression model has a slope of –2.5 and an intercept of 10. The sample coefficient of determination is 0.50. What is the value of the sample correlation coefficient?

A: A linear regression model has a slope of -2.5 and an intercept of 10. The sample coefficient of determination is 0.50. What is the value of the sample correlation coefficient? Since the slope is negative, even the correlation coefficient is negative. [ Answer: -0.7071. ]